Differences between Open and Closed Circulatory System
| Closed circulatory system e.g. Earthworm (Pheretima) | Open circulatory system e.g. cockroach (Periplaneta) |
| 1. Blood always stay in the capillary and does not be available in direct contact with other cells of the body. | 1. Blood does not stay enclosed in the capillary and comes in direct contact with other body cells, and showers them. |
| 2. Interlinked system of arteries, veins, and capillaries present. | 2. There are no normal arteries, veins, and blood vessels and for much of the time, the blood called haemolymph lows in the cavities or sinuses of the body cavity (haemocoel) around the viscera (perivisceral sinus) and around the nerve cable (perineural sinus). |
| 3. Exchange of nutrients and waste products between the blood and tissues by means of tissue fluid occurs through capillaries. | 3. Exchange of nutrients and waste products between the blood and tissues occurs when blood straight showers the tissues. |
| 4. The system also transports gases i.e. oxygen and carbon dioxide. | 4. This system does not carry gases i.e. oxygen and carbon dioxide (these gases are carried by the tracheal system). |
| 5. Breathing pigment haemoglobin is liquified in blood. Nucleated leukocyte exists. | 5. No respiratory pigment and blood is colourless in which nucleated white blood cells move. |
| 6. This is considered as the most sophisticated type, higher efficiency, preserving the blood pressure and economy of blood volume. | 6. This is regarded as primitive having lower efficiency and does not keep blood pressure. |
| 7. In earthworm there are 4 or 5 pairs of lateral hearts present on the lateral side of the oesophagus in 7th to 13th segments. Hearts pump the blood from the dorsal to the ventral blood vessel. | 7. In cockroach the heart is 13-chambered, tubular vessel present in the pericardial sinus and put in the mid-dorsal region listed below terga in the stomach.
On the side of the pericardial sinus, there are alary muscles helping in the flow of blood. Each heart chamber has a pair of lateral openings, the Ostia. |
| 8. There are three primaries longitudinally running capillary, dorsal, ventral and sub-neural, which are adjoined through capillaries and commissural vessels. | 8. The part of the tubular dorsal vessel which extends in the thoracic and head region is called the “aorta”. It opens anteriorly in the haemocoel of the head by.
funnel-shaped opening. |
| 9. The dorsal vessel gathers blood from the 14th sector backwards. In the first 13 segments, it ends up being dispersing channel and sends its blood to hearts and anterior end of the body.
The ventral vessel is the primary distributing vessel with backwards low. The sub neural vessel is collecting vessel and the flow of blood is backwards. It. interacts with dorsal capillary through commissural vessels. |
9. The flow of blood from the heart to, aorta to, haemocoel in the head, to perivisceral sinus, to perineural sinus, to per visceral sinus, to pericardial sinus, and to the heart through Ostia. |
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